Reapply "S3 Test"

This reverts commit 35f4133001.

Models/S3Settings.cs

@@ -0,0 +1,12 @@
+
+namespace Pldpro.Web.Models;
+
+public sealed class S3Settings
+{
+    public string ServiceURL { get; set; } = string.Empty;
+    public string AccessKey { get; set; } = string.Empty;
+    public string SecretKey { get; set; } = string.Empty;
+    public bool UseHttp { get; set; } = true;
+    public bool ForcePathStyle { get; set; } = true;
+    public string? DefaultBucketPrefix { get; set; }
+}